| 摘要 |
PROBLEM TO BE SOLVED: To simultaneously perform forming of a section which has a difference in step part rapidly changing distances between a normal face continuous to a bending ridgeline and the bending ridgeline, and a bending process for the ridgeline. SOLUTION: When a bending blade is butted on a work W, a connecting face 9c of the bending blade is abutted on the work W at the same time as the section not arranging with a difference in steps of a tip face 9a. That is, the timings that the bending blade is abutted on the work W is coincided over a whole bending ridgeline. In spite of further descending the bending blade, the connecting face 9c is continuously brought into close contact with the work W, the work W is pressed. Thus, the bending of ridgeline 2 is uniformly advanced as a whole, wrinkle and strain are not partially generated. Up to complete bending, the difference in step part 4 is formed with the difference in step shape of the tip face 9a of the bending blade and the upper face 8a of a lower punch.
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